Explanation:
It is given that,
Speed of an automobile is 25 km/h or 6.95 m/s
Kinetic energy of the automobile is [tex]10^4\ J[/tex]
(a) Kinetic energy of automobile s given by :
[tex]K=\dfrac{1}{2}mv^2\\\\m=\dfrac{2K}{v^2}\\\\m=\dfrac{2\times 10^4}{(6.95)^2}\\\\m=414\ kg[/tex]
(b) If the velocity of the car is increased to 45 km/hour or 12.5 m/s, new kinetic energy becomes :
[tex]K=\dfrac{1}{2}\times 414\times (12.5)^2\\\\K=32343.75\ J[/tex]
(c) If the velocity is increased to 80 km/hour, 22.23 m/s, So
[tex]K=\dfrac{1}{2}\times 414\times (22.23)^2\\\\K=102293.79\ J[/tex]
Hence, this is the required solution.
Which has more momentum: a 30 kg bicycle moving at 10 m/s or a 300 kg car at rest?
A bicycle
B car
c they have the same momentum
Momentum = mass × velocity
Case IMomentum of bicycle = 30 × 10 = 300 kgms¯¹
Case IIMomentum of car = 300 × 0 = 0 kgms¯¹
Therefore, 300 > 0 so momentum of bicycle is more. Hence, option A is correct.70 POINTS HELP PHYSICS THE PICTURE HAS THE QUESTION AND POSSIBLE CHOICES
Answer:
0.3 m/s
Explanation:
0.5 - 0.2 = .3
What statement is best supported by the information in the chart?
Answer:
Object 1
Explanation:
The statement best supported by the information in the chart is that the object 1 is the heaviest.
What is weight?Weight is the product of mass of the object and gravitational acceleration of the Earth g =9.81 m/s².
As the balance tips towards the object, the object is heavier than the weight.
Thus, the object 1 is the heaviest.
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A 1,500 kg car hits a boulder with a force of 500 N, and the collision takes 0.5
seconds. What is the magnitude of its impulse?
A. 75,000 kg-m/s
B. 50 kg-m/s
C. 250 kg-m/s
D. 750 kg-m/s
Answer: C.
250 kg-m/s
Explanation:
Given that the
Mass M = 1,500 kg
Force F = 500 N
Time t = 0.5 seconds
From Newton's second law of motion which state that the rate of change of momentum is proportional to the applied force.
F = mV/t
Ft = mV
Where ft = impulse: the product of time and applied force
Substitutes force and time into the formula
Ft = 500 × 0.5 = 250 Ns
Answer:
c
Explanation:
just took the quiz
If you are swimming upstream (i.e., against the current), at what speed does your friend on the shore see you moving?
How have scientists played an important role in history?
A. Scientists control most governments in the world.
B. Scientific discoveries have changed the world.
C. Most political decisions are made by scientists.
D. Historians are mostly scientists.
Answer:
B
Explanation:
B makes the most sense in my opinion. because different discoveries have influenced many factors of the world
Answer: B.
Explanation:
A scientific discovery that has changed the world is Edward Jenner’s vaccine against the smallpox. His vaccine has been further modified to combat other diseases.
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Cicadas produce a sound that has a frequency of 123Hz. What is the wavelength of this sound in air at room temperature? (2.79m)
Answer:
2.72 m
Explanation:
Sound travels at a certain speed and has a frequency and wavelength. The relationship between the speed of sound (V), its frequency (f), and wavelength (λ) is the same as for all waves, it is given by the equation:
V = fλ
The speed of sound in air (V) is 334 m/s
Frequency of sound (f) = 123 Hz
Wavelength = λ
V = fλ
λ = V/f = 334/123
λ = 2.72 m
A student is flying west on a school trip from Winnipeg to Calgary in a jet that has an air velocity of 792 km/h.The direction the plane would have to fly to compensate for a wind velocity of 62.0 km/h [N] is _____° S of W. (give your answer with the correct number of significant digits and do not include units)
Answer:
The direction the plane would have to fly to compensate for a wind velocity of 62.0 km/h[N] is 4.5° S of W
Explanation:
The given parameters are;
Velocity of Jet = 792 km/h
Direction of jet velocity = West
Velocity of wind = 62.0 km/h
Direction of wind velocity = North
Therefore, the jet has to have a component of 62.0 km/h South of West to compensate for the wind velocity
The direction of the plane, θ° South of West (S of W) to compensate for the wind is given as follows;
[tex]Tan \left (\theta \right )= \dfrac{62}{792} = \dfrac{31}{396}[/tex]
Therefore;
[tex]\theta = tan^{-1}\left (\dfrac{31}{396} \right ) = 4.476^{\circ} \approx 4.5^{\circ}[/tex]
The direction the plane would have to fly to compensate for a wind velocity of 62.0 km/h[N] = 4.5° S of W.
The direction the plane would have to fly to is : 4.5° south of west
Given data :
Jet velocity = 792 km/h
wind velocity = 62 km/h
Given that the direction of the jet velocity is west and the direction of the wind velocity is north.
The direction of component velocity of the Jet would be 62 km/h south of west
Determine the direction ( ∅ ) of the plane south of westTan ( ∅ ) = 62 / 792
Therefore ( ∅ ) = Tan⁻¹ ( 62/792 )
≈ 4.5° S of W
Hence we can conclude that The direction the plane would have to fly to is : 4.5° south of west
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What’s the a chicken nugget
What is the total resistance of five 10 ohms resistors in life parallel... a)500 ohms
B)2 ohms
C)10 ohms
D)50 ohms?
Answer: B
R = 2 ohms
Explanation:
When resistors are connected in parallel, the equivalent resistance R will be less than the least resistance.
1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 + 1/R5
Since the 5 resistors are 10 ohms each, substitute them in to the formula
1/R = 1/10 + 1/10 +1/10 + 1/10 + 1/10
The LCM = 10
1/R = 5/10
Reciprocate both sides
R = 10/5 = 2 ohms
The correct option is B
A dog walks Along the ground. If the dog applies an action force on the ground, what is the reaction force?
Answer: The answer is weight.
Explanation:
How can I makeup a physics scenario that includes concepts of work and energy. Should I make something going up or down a ramp!? JUST a SCENARIO plss!!!I'm stressed! I need to be able to make a solution for this made up scenario that includes work and energy calculations.
Answer: Work done = 100Nm
Potential energy = 250 J
Find the remaining solution in the explanation
Explanation:
A person carrying a heavy weight of load without moving does no work. But the load will surely experience potential energy.
Work will be done when he or she covers a little distance.
If the weight of the load = 25 N and the distance covered is 4 metres, the workdone will be the product of the weight and distance covered. That is,
WD = F × d
WD = 25 × 4 = 100Nm
Let assume that the height of the man is 10 m tall.
The load will be experiencing potential energy of mgh. That is,
P.E = mgh
Since weight W = mg
Substitute weight and height into the formula
P.E = 25 × 10 = 250J
NEED HELP ASAP!!!!!!!!!!!!!!!!1
Tricep extensions work which of the following muscles:
Biceps
Soleus
Triceps
all of the above
Answer: Its biceps
Explanation: the extension of the triceps are the biceps.
An important step toward a more complete understanding of blackbody
radiation occurred when Max Planck developed a theory that presented which
of the following ideas?
A. Light is composed of discrete chunks that must be absorbed as a
unit.
B. Large objects can be viewed as acting as waves.
C. Electrons can act as both waves and particles.
D. Matter is composed of discrete chunks that cannot be broken
down.
Answer:
The correct option is;
C. Electrons can act as both waves and particles
Explanation:
The quantum theory theory developed by Max Planck established that effect of radiation on a blackbody can be explained by the fact that energy can exhibit physical characteristics which implies that energy can have both wave-like and physical characteristics
With Planck's law, light and electrons are known as having wave particle duality, that is they can act as both waves and particles.
Answer:
The answer is A. Light is composed of discrete chunks that must be absorbed as a unit.
Explanation:
Hope this helps.
Which statement about magnets and magnetic fields is correct?
A. Magnetic fields apply a force on any object with a mass.
B. Magnetic fields apply a force on any metal.
C. Magnetic fields apply a force on magnets.
D. Magnetic fields apply a force on electrically conductive metals.
Answer:
B. Magnetic fields apply a force on any metal.
Explanation:
hope this helps u
Answer:
Magnetic fields apply a force on magnets.
Explanation:
this is correct
Sometimes on a sunny day campers start a campfire using a small mirror to light paper or dry grass. What shape of mirror would you use for this purpose? Explain your choice using reasoning.
Answer: concave mirror
Explanation: There are different types of mirror. Plain, concave and convex mirror to mention a few. Among the mirrors mentioned above, concave mirror has highest focal point. The ability to focus all the beam of light incident on it at a point which can ignite a fire.
Using a small mirror to light paper or dry grass, the shape of mirror to use for this purpose is therefore a concave mirror.
What must a magnet always have?
A. Two like poles
B. Two opposite charges
C. Two like charges
D. Two opposite poles
Answer:
the anwser is d
Explanation:
you must have a north and south pole
Answer:
your anwser would be
D) two opposite poles
A loop of wire is placed into a magnetic field between two magnets. Since this is a three dimensional, a dashed line is drawn through the loop to show the imaginary slice we take that allows us to picture the electron current flow from different perspectives. How do you think the loop will move? Describe this from the front view perspective
a) clockwise
b) counter-clockwise
c) up
d) down
Answer: the loop will move up
Explanation:
Whenever an electric current cuts across magnetic field lines, a force is exerted on the current - carrying conductor
According to Fleming's left hand rule, the thumb is the direction of motion.
First finger is the direction of magnetic field, while the second finger is the direction of the conventional current.
When a current flow in the will, the wire will experience an upward force. And continue to rotate in an up - down direction. Therefore, the loop will move up.
Lenses work using the _____
of light.
A) emission
B) reflection
C) refraction
D) absorption
The presence of electrons in a substance makes it a conductor of electricity.
True
False
Answer:
False
Explanation:
Just finished the exam
The presence of 'free electrons' in a substance makes it a conductor of electricity. So, the statement is false.
What is meant by a conductor ?The objects or substances that let the flow of electricity through them are known as conductors. The ability to carry heat is another benefit of conductors.
Here,
Since, every electron in an atom carries a negative charge, they can serve as our charge carriers. We can produce electricity if we can compel an electron to move by releasing it from its atom.
Current flowing through the conductors is caused by the free electrons present in them.
Free electrons are valence shell electrons with a weaker nucleus-electron interaction; as a result, they are free to travel in the metal, which acts as a conductor, and carry out current flow.
Hence,
The presence of 'free electrons' in a substance makes it a conductor of electricity. So, the statement is false.
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A boy pushes on a wagon so that it accelerates at a rate of 0.50 m/s2. The wagon has a mass of 24 kg. What is the magnitude of the boy's pushing force? (Ignore frictional effects.) 12 N 12 kg 48 N 48 kg
Answer:
12N
Explanation:
Force acting on any body is equal to mass of body multiplied by acceleration produced in the body.
Its formula is
F = M*a
where F is the force acting on body
M is the mass of the body
a is the acceleration produced in the body
Unit of force is Newton represented by N
1 N is force acting on body of mass 1 kg which produces acceleration of 1m/s^2.
_____________________________________
Given
a = 0.50 m/s^2
M = 24 kg
therefore
F = 24*0.5 = 12 N
Thus, magnitude of the boy's pushing force is 12 N.
What is the electric potential 20.0 cm from a negative point charge of 15 µC?
Answer: V = 675000v
Explanation:
Electric potential V can be calculated by using the formula
V = Kq/r
Where
V = electric potential
q = charge = 15µC
K = Coulomb constant = 9 × 10^9Nm^2C^-2
r = 20 cm
Substitute all the parameters into the formula
V = (9×10^9 × 15×10^-6)/20×10^-2
V = 135000/0.2
V = 675000 volt
A particular planet has a moment of inertia of 8.26 × 10^(36) kg⋅m^2 and a mass of 6.54 × 10^22 kg. Based on these values, what is the planet's radius? Hint: Because planets are the shape of a sphere, the moment of inertia is I = (2/5)mr^2.
Answer: 1.776933x10^7
Explanation:
Moment of inertia I = 8.26x10^36kgm^2
Mass of planet m = 6.54x10^22kg
Also, Planet is solid sphere so that, Moment of inertia is I = _2_ m
R^2= 0.4 R^2 5
Where R is radius of planet
Putting into calculation
We get,
I = _2_ m R^2
5
8.26x10^36 = 0.4x6.54x10^22xR^2
8.26x10^14 = 2.616 R^2
R = 1.776933x10^7
The radius of the planet which has a mass of 6.54× 10²² kg and inertia of 8.26 × 10³⁶ kg/m² is 1.776933 × 10⁷.
What is Moment of Inertia?Moment of inertia is a quantitative measure of the rotational inertia of a body. It is the opposition which the body exhibits to having its speed of rotation about an axis altered by the application of a torque.
Moment of inertia I = 8.26 × 10³⁶ kg
Mass of planet m = 6.54× 10²² kg
Also, Planet is solid sphere so that, Moment of inertia is I = 2/5 m R² = 0.4 mR²
where, R is radius of planet
Putting into calculation
We get,
I = 2/5 m R²
8.26 × 10³⁶ = 0.4 × 6.54 × 10²² × R²
8.26 × 10¹⁴ = 2.616 R²
3.15749235 × 10¹⁴ = R²
R = 1.776933 × 10⁷
Thus, the radius of the planet is 1.776933 × 10⁷.
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In Los Angeles, the temperature at 3:00 p.m on Aug 16th is
73.9 °F. What is the temperature in °C?
°C.
Answer:
The temperature on 16th August is 23.37 degree Celsius.
Explanation:
In Los Angeles, the temperature at 3:00 p.m on Aug 16th is 73.9 °F. It is required to convert it into degree Celsius.
The conversion from Fahrenheit to Celsius is as follows :
[tex]C=(F-32)\times \dfrac{5}{9}\\\\C=(73.9-32)\times \dfrac{5}{9}\\\\T=23.27^{\circ} C[/tex]
So, the temperature on 16th August is 23.37 degree Celsius.
what’s the difference between gravitational force & gravitational field strength?
Answer:
Gravitational field strength is the force experienced by a unit mass. Gravitational force is the amount of force acting on a body. It is the product of field strength times the mass under consideration. Gravitational pull is just a more colloquial name for gravitational force.
Explanation:
hope it helps u
what’s the difference between gravitational force & gravitational field strength?
Jerimiah is studying Wave A and Wave B. Wave A is traveling at 3 hertz, and Wave B is traveling at 1.2 hertz.
What can be predicted about the waves if they were to crash into each other?
A) Refraction would occur
B)Interference would occur
C) the resulting wave would travel at 4.2 hertz
D) the crest of wave A would overlap the trough of wave B
Please hurry
6-4-2020
Answer: the answer is B
Explanation:
Answer:
The resulting wave would travel at 4.2 hertz.
Explanation:
What is the mass of an object that weighs 198 N?
Answer: An object weighs 2800 lb
Explanation:
where was forensic science first used to solve a crime?
Answer:
In 1836, Scottish chemist, James Marsh, did the first application of this forensic science technique. This test was actually used successfully in a murder trial at that time.
Explanation:
I hope that is what you were asking
Answer: London , United Kingdom
Explanation:
In 1836, Scottish chemist, James Marsh, did the first application of this forensic science technique.
Order the steps to describe how information is sent. A signal is produced. A signal is seen, heard, or used. Radio waves are modulated and amplified. Radio waves are amplified and demodulated.
Answer:
A signal is produced.
Radio waves are modulated and amplified.
Radio waves are amplified and demodulated.
A signal is seen, heard, or used.
Explanation:
Communication is the method of transmitting information between two or more participants. A radio communication network is a set of static and wireless radio equipment developed to facilitate an entity by enabling particular modes of communication such as one-to-many and one-to-one communication. Radio waves are being used to transmit information spatially from the sender to receiver, by modulating the radio signal in the transmitter. The above steps explains the loop of the radio communication system.
Answer:
A signal is produced- 1
A signal is seen, heard, or used- 4
Radio waves are modulated and amplified- 2
Radio waves are amplified and demodulated- 3
Explanation:
got is correct on edge 2020
A 6 kg table has a net force of 15 N acting on it. What is the magnitude of the acceleration of the table?
Answer:
2.5m/s2
Explanation:
F=ma
a=F/m
a=15/6
a=2.5m/s2